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A bit of research has shown that the proposed implementation will not work either, so my next suggestion is something along the lines of
def move2(src, dst):
 try:
 os.link(src, dst)
 except OSError as err:
 # handle error appropriately, raise shutil.Error if dst exists,
 # or use shutil.copy2 if dst is on a different filesystem.
 pass
 else:
 os.unlink(src)